SizeOn Maximum Performance
Gaspari Nutrition

SizeOn Maximum Performance

With Outlast Carbohydrate Matrix!
Hybrid Intra-Workout Whey Hydrolysate Creatine Formula!
8.9  out of 10  (413 Reviews)
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Product Overview

Bottle Lines
4g L-Leucine
Per serving
Inhibits Muscle Protein Breakdown.
Key Benefits:
  • Accelerates Protein Synthesis & Muscle Force Recovery*
  • Increase Muscle Volume, Muscle Fiber Size, Cell Volume & Plasma Amino Acid Levels*
  • Includes Highly Branched Cyclic Dextrin Infused Carbohydrate Blend
SIZEON ® is the most recent breakthrough in Creatine science. Using a tri-phase Creatine blend to offer unmatched bioavailability, absorption, and digestion, SIZEON will prime your body for more explosive strength and power gains than ever before.* SIZEON also includes an industry leading 4g of L-Leucine for maximal anabolism during and after training, as well as AmmoJECT to help with lactic acid build up in muscle tissue created during training.*
Empowering Real People With Real Science
Gaspari Nutrition represents the ultimate bridge between clinical science and real world results. Offering the most cutting edge and innovative ingredients & formulas available, Gaspari Nutrition gives you an advantage on the competition like nothing else can. This advantage begins with premium quality raw materials and extends into our unrivaled cGMP certified manufacturing facility. Once it is in your hands, you will have the most tested, tried and proven supplements to help you take your training and physique to the next level.

Ratings & Reviews

SizeOn Maximum Performance
Overall Rating
413 Ratings
Verified Buyer Rating
69 Ratings
Average Flavor Rating
5 Flavors
Top Rated Flavor
By clicking the button above, you agree to entering the Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
Aug 09, 2020
  • 10 Wild Berry Punch

Love this product. Its got everything I need for recovery, Plus I did an extremely hard leg training day and drank this throughout and I got zero symtoms of an upset stomach.

Oct 19, 2017
  • 10 Orange Cooler

SIZEON is an intimidatingly massive intraworkout product that leads with 40 grams of carbohydrates and 7 grams of protein. The carbohydrate complex is a mixture of three carb sources, but it is mostly 39 grams of trehalose and dextrose, which are simple carbs. Would love to see more cyclic dextrin in the blend, but still great to have the nice dose of carbs. The 7 grams of protein are from Whey Protein Hydrolysate, which is a quality protein source. The rest of the formula is BCAAs, creatine, taurine, and electrolytes and vitamins. There is no way around it: the formula is massive! It hits everything you could want or need in an intraworkout. I have loved using SIZEON!! It is such a delicious flavor for one. The orange cooler is essentially a slightly sweeter and thicker orange juice. I typically use in 24 oz of water and refill with water after drinking half during a workout. The carbs are really sustaining, helping me endure long, grueling workout. SIZEON has really opened my eyes to the importance of carbs before/during workouts. Sometimes I feel like I even burn through the 40 grams of carbs in SIZEON too quickly. SIZEON has really been a great part of my workouts, and I think has helped me improve size and strength during use. The profile, flavoring, and performance effects are all clearly 10s out of 10s. The price per serving is a little high at $1.78 - would love to see it around $1.50 per serving though the formula is huge. I definitely think grabbing a tub of SIZEON is worthwhile, especially if on sale.

May 25, 2017
Verified Buyer
  • 10 Lemon Ice
  • 9 Orange Cooler
  • 10 Wild Berry Punch

First of all I'™d like to that dougefresh93 and Gaspari for putting on the Super Bowl Squares promo!!! Also thanks to the Patriots for beating the Failcons, in such an awesome way. I received my tube of Artic Lemon Ice on 2/15/17 and have used it exclusively as my intra-workout drink since then. BTW, I am almost out so I'll be ordering more. Guess that tells you how this review is going to go. At 190 calories with 40g of total carbohydrates, 7g of protein and multiple forms of creatine it is a great package of everything I want and need. The Artic Lemon Ice taste amazing as I mixed it with 40oz of water and sipped it during my workouts. Over the last month my calculated 1RM in the following lifts have increased as follows (in pounds). I am 5'™10" @ 175lbs. Deadlifts 200 -> 270 OHP 135 -> 145 Squat 160 -> 175 Bench 215 -> 230 Now, I have just added deads and squats to my routine over the last few months. I had avoided them because of 4 major back surgeries, but I'™ve checked my ego and started slow. Physically I feel like I look fuller, muscle mass wise. I feel plenty of stamina during my workouts and I feel as though I leave it all on the table by the time I am done in the gym!! This personal success (in my eyes) has lead me to keep SizeOn as my intra-workout and also got me to try SuperPump 250 (highly recommend). Thanks again!!

May 10, 2017

This is a great product for someone looking to put some "Size-On"; complete with intra-workout carbs, BCAA's, creatine, and much more! I didn't ever used intra-workout carbs in the past, but have become very fond of them. I just do a half scoop, but feel the intra-workout carbs really give me a boost in energy to push through tough sessions. I wish the flavor was perhaps a bit more sweet/refreshing, like classic lemonade, but it is still pretty good - definitely still enjoyable. Overall, probably not something I would use while dieting, but if you are looking for a nice pre/intra-workout to boost your energy without the caffeine this is a great product. I really enjoyed using it.

Apr 25, 2017

In my years of fitness I've generally kept products like SizeOn as a post workout. So what I did instead was spent several workouts using it as a post workout, and then several as it was designed, an intra-workout. What I found was that, as strictly a Post Workout drink, it pulls you right out of your fatigue, especially when you mix it with some protein. I used Arctic lemon and a vanilla protein powder....great combo. Now, when using it as intra-workout, I didn't necessarily notice anything significant, but certainly the added carbs and sugars were a nice departure from just water. I won't say it didn't help, but with all the other stuff I take before training, it's hard to pin down what SizeOn can do during a session. Now, here's the tricky bit- I just started my cut for summer, and the carbs in one serving makes juggling macros hard for me only because I love to inatead I cut the dose a little. I know that takes away from efficacy but I found that if I take this strictly post-workout during my cut, I get all the benefits of the pick-me-up with less carbs, and I still feel great afterwards. I highly recommend the Lemon, especially because it works very well with vanilla flavored mixers and add-ons...

Mar 23, 2017

The flavor is delicious! Especially when mixed with ice cubes. I usually took it while preparing for my heavy sets of 5-3-1. Mixes very well and helped me gain about ~7 LB's in 2 months with over 60 LB's to my max's on big 3. Highly recommend this product! You don't feel hungry during the workout which used to be an issue for me

Mar 15, 2017

As far as intra-workouts go, this one is a beast. In addition to a nice dose of amino acids, this mix sports a combination of different types of creatine, as well as carbs. It also has some whey hydrolysate for fast protein absorption. A little bit of everything that helps boost workouts, as it is. I experimented with taking this every other workout so as to gauge its effectiveness, and I can say that the workouts that were fueled by SizeOn were noticeably improved. It replenishes you between sets and helps keep you energized. Not to mention the Arctic Lemon Ice is a fantastic flavor, and I tended to drink it more quickly than I really meant to, especially during heavy squats and bench presses. I really like this stuff a lot.

Feb 28, 2017
  • 9 Grape Cooler

SizeOn is described as "The Ultimate Hybrid Intra-Workout Amino Acid & Creatine Formula" and id say thats a spot on description. in addition to the Aminos and Creatine, SizeOn also contains high quality Carbs, Whey Protein Hydrolysates and an Advanced Hydration Complex. these all combine to give you increased performance, skeletal muscle recovery, explosiveness and muscle size. i loved sipping on this during training. the Grape tastes great, mixes easily, is super refreshing and keeps you hydrated and full of electrolytes. SizeOn really is a quality product and easily recommended!

Feb 21, 2017
Verified Buyer
  • 8 Grape Cooler
  • 9 Wild Berry Punch

Thanks Gaspari...

Jan 27, 2017
  • 10 Grape Cooler
  • 10 Orange Cooler
  • 10 Wild Berry Punch

Gaspari SizeOn, after years in the "supplement game," is one of the few staples that I will still spend money on. The tub lasts for a full 24 workouts, the profile is absolutely outstanding, and the taste is perfect for an intra-workout despite all the actives.

Jan 24, 2017
  • 9 Grape Cooler
  • 9 Orange Cooler
  • 10 Wild Berry Punch

Complete Intra workout product to help power you through your workouts! Very solid profile and great tasting flavors. SizeOn has been a staple of mine for a long time and continues to help me reach my goals. Highly recommended!

Nov 16, 2016
  • 10 Grape Cooler

If you're looking to put on size quick, this supplement is the answer. I just recently returned home from U.S. Army basic combat training, and due to the fact that Army PRT mainly calls for body weight exercises, I lost quit a lot of mass. It was depressing and embarrassing once I stepped back in the gym to see how far my total had dropped and how small I was. My dad had bought a tub of this and wasn't really using it, so he gave it to me to try out. Within a week, I had noticeable size and mass coming back and building very quickly. I understand that muscles have memory, and yes, it shouldn't take TOO long to get back to where I was. However, SizeOn has helped me gain ten lbs of muscle back in the month that I've been out of basic and been back to lifting. If mass is what you're looking for, this supp is the perfect supplement for you.

Oct 03, 2016

This WILL add size and strength. After two weeks I noticed improvements. Fill your shaker full with water and add half a scoop, sip during, chug after. Then after that mix the other half scoop with another full bottle and can drink slower after workout. The taste is phenomenal, I consume it this way so I can enjoy the other half during class in ice water. Worth every penny if used correctly.

Sep 15, 2016
  • 10 Wild Berry Punch

Gaspari definitely has score a touchdown when it comes to Size On. Each scoop contains 4g of creatine, 40g of fast digesting carbs, 7g of protein, as well as bcaas and electrolytes. Even though a scoop is 68g scoop (and the scooper is huge, i mean even bigger than some protein powder scoopers), it mixes in fairly easy in water. I was able to mix it in my half gallon jug with ease. The taste of the wild berry punch was very delicious and refreshing. It was the perfect drink to sip on during summertime workouts (but fall winter and spring it would suffice as well). I used size on for the last 2 weeks of my strength phase and although it did help me, the size on really shined for me when i used it for my cut. First it allowed me to cut back on carbs i would use for my preworkout meal (i went from using a cup of oatmeal to only requiring a half cup or just eating a grapefruit). Also with carbs being cut, it allowed me to utilize intraworkout which definitely helps give much needed energy to to complete workouts, especially when I did workouts early in the morning. While on size on, I was able to keep strength levels pretty high even though carbs were being reduced throughout the cut which has never happened before when I was on a cut. Also it helped me out with muscle recovery even though my work volume had increased (and shoulders was hit twice a week). The price point is fair at $43.98 for 24 scoops for the amount of ingredients included in the product. I will definitely look to give size on a run when i go to add on some lean mass. I would certainly say that Size-On was an asset for me while I was cutting and i would confidently recommend to anyone. Full log here:

Sep 01, 2016
  • 9 Wild Berry Punch

Really fun product to use during a period of caloric surplus. I gained size, most notably during workouts and realized I had much more energy during. This carried over to the rest of the day for me. You get a lot of goodies in this product. A maitenance dose of creatine and BCAA plus sustamine and vitamins just to name a few. Definetly worth a try for an extra push in the gym!

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Hybrid Intra-Workout Whey Hydrolysate Creatine Formula!

What's in Gaspari Nutrition SizeOn Maximum Performance

3.49 Lbs. Grape Cooler
Serving Size 1 Scoop (68 g)
Servings Per Container24
Amount Per Serving % Daily Value ‡
Calories 190       
Calories From Fat 0       
Total Fat 0 g 0%
Cholesterol 15 mg 5%
Total Carbohydrate 40 g 13%
Dietary Fiber 0 g 0%
Sugars (From Trehalose and Dextrose) 39 g **
Protein 7 g 14%
Vitamin C (As Ascorbic Acid) 60 mg 100%
Thiamin (As Thiamin Hydrochloride) 10 mg 667%
Riboflavin (As Riboflavin-5-Phosphate) 7.6 mg 447%
Niacin (As Niacinamide) 50 mg 250%
Folate (As Folic Acid) 200 mcg 50%
Vitamin B12 (As Methylcobalamin) 75 mcg 1,250%
Pantothenic Acid (As D-Calcium Pantothenate) 9 mg 92%
Calcium 51 mg 5%
Phosphorus 65 mg 7%
Magnesium 45 mg 11%
Sodium 235 mg 10%
Trehalose, Dextrose, Cyclic Dextrin, Pterostibene
Whey Protein Hydrolysate, L-Leucine (4g), L-Isoleucine, L-Valine
Creatine Monohydrate, Creatine MagnaPower® (Magnesium Creatine Chelate), Disodium Creatine Phosphate
L-Taurine, Sodium Glycerophosphate, Calcium Glycerophosphate, Potassium Glycerophosphate, Sustamine™ (L-Alanyl-L-Glutamine), Magnesium Glycyl Glutamine
‡ Percent Daily Values are based on a 2,000 calorie diet
** Daily Value not established
Other Ingredients:
Malic Acid, Citric Acid, Silica, Natural And Artificial Flavors, Salt, FD&C Red #40 Lake, Acesulfame Potassium, Sucralose, FD&C Blue #1 Lake.
Allergens: Contains ingredients from milk and soy.

Directions For SizeOn Maximum Performance: SizeOn® is meant to be taken once per day, on training days WHILE you train, 5 - 6 days per week. Mix one scoop in 20-30 ounces of cold water and sip throughout your workout. Should the need arise, add more water as necessary throughout your workout for proper hydration.

Warnings: Seek the advice of a health care practitioner before use. Not Suggested for use in children under the age of 18 or in people who have been diagnosed with hypertension, kidney disease, liver disease, metabolic syndrome, diabetes, neoplastic condition such as cancer or thalassemia. Do not use if pregnant or nursing. KEEP OUT OF REACH OF CHILDREN.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
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